Improvement in sewing-machines



3 Sheets-Sheet 1.- W. 0. GROVER.

. Sewing Machine.

No. 100,139. Patented Feb. 22, 1870.

3 Sheets-Sheet 2.

w. 0. GROVER.

Sewing Machine.

No. 100,139. Patnted Feb. 22,1870.

N4 PETERS, Pholo-Lmwghpher; Washington, D. c

' v '3 SheetsSheet- 3. W. O. GROVER.

Sewing Machine.-

Patented Feb. 22 1870.

Non 100,139.

illadmit swa WILLIAM O. GROVEB, OE BOSTON,MASSACHUSETTS.

Letters Patent No. 100,139, dated February 22, 1870.

IMPROVEMENT IN SEWING-MACHINES.

The Schedule referred to in these Letters Patent and making pert of'thesame.

To all whom it may concern Be it known that I, WILLIAM O. Gnovnn, ofBoston, in the State of Massachusetts, have made an invention of certainnew and useful Improvements in the Construction of Sewing-Machines, andthat the following is a full, clear, and exact description andspecification of the same.

The object of my invention is to enable the drivingpower to be appliedto a sewing-machine at the side thereof which is behind the axis of theneedle-arm, while the needle-arm and the looper are constructed tooperate substantially as those instrumentalities operate in the Grover8: Baker. family sewing-machines nowin common use.

To this end my inventioutconsists of the combination of the followingthree instrumentalities, viz:

First, a vibrating double-headed arm, which operates the needle fromabove the table of the sewingmachine, and also extends beneath the saidtable, and is connected with a vibrating looper so as to operate it.

I Second, a driving-shaft arranged with, its axis parallel orthereabouts with the plane of vibration of the said vibrating arm.

Third, a vibrating eye-pointed looper to inter-chain a second threadwith the thread carried by the needle.

My invention consists further ot' the combination of the aforesaid threeinstrumentalities with a reciproeating toothed advancing-instrument formoving the cloth or material to be sewed past the needle.

Mysaid new combinations are embodied in the sew-- ing-machinerepresented in the accompanying draw- 1ngs Figure 1 representing a planof the machine with the bed-plate and parts above it removed;

Figure 2 representing a vertical longitudinal section of the machine;and

Figure 3 representing a vertical transverse section of firebox-stand atthe line x a; of fig. 2, showing parts of the machine beneath thebed-plate.

In the said machine the needle is carried by a double-headed vibratingarm, A, which is constructed with a rock-shaft, c, that is arranged tovibrate upon centers secured to the bed-plate B.

One branch, d, of this arm extends beneath the bed-plate, and carries atits front end the driver f, by means of which motion is imparted to avibrating eyepointed looper, m, which is secured to the upper end use,and therefore'need not be more particularlydescribed.

The driving-shaft 1* extends under the bed-plate, and its axis isparallel with the plane of vibration of the arm A. v

The cam G, for operating said arm, is secured to this driving-shaft, andthe pin II, by which motion is imparted from the cam to the vibratingarm, projects laterally from the said arm into the groove n of the cam.The stem of the pin is fitted with a frictionwheel or bowl in the usualmanner.

The cam groove am this instance is so formedas to cause the vibratingarm A to make two complete double vibrations for each revolution of thecam, but this construction of the cam groove forms no partof theinvention.

The front end of the driving-shaft F has two cams 7c 1 secured to it,for the purpose of imparting motion to the advancing-instrnment I of thescwing-mzwhine,

one of said cams (Ii) operating to raise said instrument and to permitit to descend, and the other cam (l) operating to move said instrumenthorizontally in one directiim, a spring, t, being applied to move ithori- Auntally in the opposite direction, so that the said instruincnthas a reciprocating motion imparted to it.

The operating surface of the advancing-iustrument is roughened by smallteeth, in the usual manner, and the construction of the stock J of saidinstrument and its appurtenances are, in this instance, the same as thecorresponding parts of the Grover Baker family sewing-machine. I

The driving-shaft F extends beyond the side I) of the machine, which isbehind the rock-shaft 0, whose axis is the axis of vibration of theneedle-arm A, and the 'proj ecting extremity of the driving-shaft isfitted with a fly-wheel, E, to one of the arms of which a crank-handle,g, is secured for the purpose of enabling the machine to be operated by.hand. i

If the machine is to be operated by power, the crank-handle is removed,and a pulley is secured to the outer side of the fly-wheel or to theextremity of the driving shaft to receive the driving-belt.

-The bed-plate B forms the top of a box, 0, which contains all the partsof the machine that require protection, and forms a convenient case bywhich they are protected from injury, and it also sustains the flywheelE at such a height above the legs of the boxstand that the machine maybe set upon any ordinary table and operated by hand.

Having thus described a sewing-machine embodying my invention, I declarethat I do not now claim severally the separate instrumcntalities ofwhich my combinations are composed, but'what I claim as the invention tobe secured by these Letters Patent is- The combination and arrangementof the doubleheaded vibrating arm, the driving-shaft, having its axisarranged parallel to the plane of vibration of said arm,'and thevibrating eye-pointed looper, the

whole constructed to operate substantially as before set forth.

Also, the combination and arrangement of the dollhle-headed vibratingarm, the drivingshaft, having its axis arranged parallel to the plane ofvibration of said arm, the vibrating eye-pointed looper, and thereciprocating toothed advanoing-instrmnent, the

whole constructed to operate substantially as before set' forth.

In testimony whereof, I have hereto set my hand this 3d day of March,1869.

Witnesses: W. O. GROVER.

JAMES H. Baowx, J;- MEs O. \VADE.

